Compare software

Semantic ScholarPubMed
Free

Free to use in the browser.

 Free

Free to use, run by a US government agency.

Web, Browser extension Web
  • Index of more than 238 million papers across all fields of science
  • Free to search without cost
  • Over 40 million biomedical citations in one place
  • Advanced search, clinical queries and MeSH browsing
  • Semantic Reader is in beta and only available for select papers
  • Web only, with no offline use
  • Mostly citations and abstracts; full text depends on PubMed Central or publishers
  • Limited to biomedical and life-sciences subjects
Web application, Browser extension Web application
Closed source Closed source
License not stated License not stated
Not stated if an account is needed No account needed
Needs internet Needs internet

Checked September 23, 2026

Checked October 1, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.